<template>
    <div class="goodsinfo-container">
        <transition @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
            <div class="ball" v-show="ballFlag" ref="ball"></div>
        </transition>
        <!-- 商品轮播图区域 -->
        <div class="mui-card">
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
                </div>
            </div>
        </div>
        <!-- 商品购买区域 -->
        <div class="mui-card">
            <div class="mui-card-header">{{ goodsinfo.title }}</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p class="price">
                        市场价: <del>￥{{ goodsinfo.market_price }}</del>&nbsp;&nbsp;&nbsp;销售价: <span class="now_price">￥{{ goodsinfo.sell_price }}</span>
                    </p>
                    <p>购买数量：<numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox></p>
                    <p>
                        <mt-button type="primary" size="small">立即购买</mt-button>
                        <mt-button type="danger" size="small" @click="addToshopCar">加入购物车</mt-button>
                    </p>
                </div>
            </div>
        </div>
        <!-- 商品参数区域 -->
        <div class="mui-card">
            <div class="mui-card-header">商品参数</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p>商品货号: {{ goodsinfo.goods_no }}</p>
                    <p>库存情况: {{ goodsinfo.stock_quantity }}件</p>
                    <p>上架时间: {{ goodsinfo.add_time | dateFormat }}</p>
                </div>
            </div>
            <div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
            </div>
        </div>
    </div>
</template>

<script>
//导入轮播图组件
import swiper from '../subcomponents/swiper.vue'
//导入数字选择框组件
import numbox from '../subcomponents/goodsinfo_numbox.vue'

export default {
    data(){
        return {
            id: this.$route.params.id,   //将路由参数对象中的id挂载到data上
            lunbotu: [
                { src: "https://img.alicdn.com/imgextra/i3/3294889394/O1CN01LvCsS52JGVA0K6XJG_!!3294889394.jpg_430x430q90.jpg"},
                { src: "https://img.alicdn.com/imgextra/i4/3294889394/O1CN01Vbtnnq2JGV9uwgGNv_!!3294889394.jpg_430x430q90.jpg"},
                { src: "https://img.alicdn.com/imgextra/i2/3294889394/O1CN01TAR3rj2JGVA0K64Dj_!!3294889394.jpg_430x430q90.jpg"}
            ],
            // lunbotu: [],  //轮播图的数据
            goodsinfo: {
                title: "FollowMe城市香氛系列泡沫洗手液青色岚山留香易冲洗250ml",
                market_price: "20.00",
                sell_price: "19.80",
                goods_no: 21423534534634,
                stock_quantity: 20,
                add_time: Date.now()

            },
            // goodsinfo: {},  //商品信息
            ballFlag: false,  //控制小球隐藏和显示
            selectedCount: 1  //用户选中的商品数量
        };
    },
    created(){
        this.getLunbotu();
        // this.getGoodsInfo();
    },
    methods: {
        getLunbotu(){
            //循环轮播图数组每一项为其添加img属性，为符合轮播图组件中的变量
            this.lunbotu.forEach(item=>{
                item.img = item.src;
            })
        },
        // getLunbotu(){   //获取服务器轮播图数据
        //     this.$http.get('api/getthumimages/' + this.id).then(result => {
        //         if(result.body.status === 0){
        //             this.lunbotu = result.body.message;
        //         }
        //     });
        // },
        // getGoodsInfo(){   //获取商品信息
        //     this.$http.get('api/goods/getinfo/' + this.id).then(result => {
        //         if(result.body.status === 0){
        //             this.goodsinfo = result.body.message[0];
        //         }
        //     });
        // },
        goDesc(id){  //编程式导航跳转图文介绍界面
            this.$router.push({name: "goodsdesc", params: { id }});
        },
        goComment(id){   //编程式导航跳转到评论页面
            this.$router.push({name: "goodscomment", params: { id }});
        },
        addToshopCar(){
            this.ballFlag = !this.ballFlag;
            //拼接出一个要保存到store中car数组中
            var goodsinfo = { id: this.id, count: this.selectedCount, price: this.goodsinfo.sell_price, selected: true };
            //调用store中的mutations将商品加入购物车
            this.$store.commit("addToCar", goodsinfo)
        },
        beforeEnter(el){
            el.style.transform = "translate(0, 0)";
        },
        enter(el, done){
            el.offsetWidth;
            //动画不准确 原因：将最终位移写死了（受分辨率和滚动条影响），需动态计算，购物车徽标与小球当前的横纵坐标的差（Dom.getBoundingClientRect()）
            //获取小球在页面中的位置
            const ballPosition = this.$refs.ball.getBoundingClientRect();
            //获取购物车徽标在页面中的位置
            const badgePosition = document.getElementById("badge").getBoundingClientRect();
            const xDist = badgePosition.left - ballPosition.left;
            const yDist = badgePosition.top - ballPosition.top;
            el.style.transform = `translate(${xDist}px, ${yDist}px)`;
            el.style.transition = "all 0.5s cubic-bezier(.4,-0.3,1,.68)";
            done();
        },
        afterEnter(el){
            this.ballFlag = !this.ballFlag;
        },
        getSelectedCount(count){
            //获取个数时，涉及到子组件goodsinfo_numbox.vue向父组件goodsinfo传值，用事件绑定的方法,传递参数保存
            this.selectedCount = count;
        }
    },
    components:{
        swiper,
        numbox
    }
}
</script>

<style lang="scss" scoped>
.goodsinfo-container{
    background-color: #eee;
    overflow: hidden;
    .now_price{
        color: red;
        font-size: 16px;
        font-weight: bold;
    }
    .mui-card-footer{
        display: block;
        button{
            margin: 15px 0;
        }
    }
    .ball{
        width: 15px;
        height: 15px;
        border-radius: 50%;
        background-color: red;
        position: absolute;
        z-index: 99;
        top: 410px;
        left: 146px;
    }
}
</style>